Fan



June 6, 1939. L. i. DQLLINGER WLG-27 FAN Filed April 14, 1936 2Sheets-Shaet l Jal pumas',

BY Y n MHA TTORNE Y June 6, 1939, l. 1 DOLLINGER 2,161,027

FAN

Filed April 14, 19256 2 Sheets-Sheet 2 INVENTOR J. ew/5 lyon1/Vern' I/f0 w lATTORNEY Patented June 6, 1939 PATENT OFFICE FAN Lewis L.Dollinger, Rochester, N. Y., assignor to Staynew Filter Corporation,Rochester, N. Y.

Application April 14, 1936, Serial No. 74,308

2 Claims.

This invention relates to an air filtering and conditioning mechanismand has for one oi' its objects to so combine a i'an with an`air iilterthat all air brought in circulationfwith the fan 5 is eilicientlyfiltered thereby. f

A further object of this invention is to so combine a fan with an airfilter that the filter will absorb practically all of the fan noises.

Another object of this invention is to provide a fan with combinedvfilter and noise silencing means to make the operation of the fansubstantially noiseless.

All these and other objects and attendant advantages of this inventionwill become more readily apparent from the detailed description ofseveral embodiments thereof, reference being had tothe accompanyingdrawings in ,which Figure l is a side elevation of a fan equipped with afilter in accordance with my invention, the filter being illustrated insection. l

Figure 2 is a side elevation of a fan equipped with a filter and noisesilencing outlet in accordance with my invention, the filter and outletbeing shown in section.

Figure 3 is a side elevation of a fan equipped with a modied form oflter in accordance with my invention.

Figure 4 is a vertical sectional view of a cabinet unit embodying myinvention of a fan equipped with a filter and noise silencing means.

Figure 5 is a diagrammatic view of a room provided with one of thecabinet fans illustrating the distribution of the air by the fan withinthe room.

In the several gures of the drawings like ref- 35, erence numeralsindicate like parts.

Electric fans used for circulating air in rooms for cooling purposescause dust to be picked up by theair currents so that.` the fan willconstantly circulate dust laden air thru the room. Thus, 40 while theair currents created by the fan have a cooling effect, this coolingeii'ect is produced at the expense of loading the air with dustparticles. The use of fans has been found very objectionable for thisreason and also because of the tan noises created by them in theiroperation.

Bo'th of these objectionable features in the use oi' a fan have beeneliminated by my .present invention which combines the fan with a iilterin such a manner `that it not only lters the air which it delivers, butalso reduces the noise cr`eated by the fan in delivering the air. Inaddition thereto the outlet for the discharge of the filtered air is soconstructed and arranged in combination with the fan and filter that itfuru ther silences the fan noises and makes the use of the combined fanand filter substantially noiseless.

In the embodiment of my invention illustrated in Figure l the fan i isdriven by the motor 2 which is supported on the standard 3 and may or 5may not be mounted to cscillate thereon. The fan is surrounded by thefixed guard cage 4 and on this cage is supported a iiltering unit. Thisunit comprises a suitable perforate housing 6, one end of whichsurrounds the periphery of the cage 10 4 and is suitably fastenedthereto. 'Ihe perforate housing extends from the cage 4 and is coveredat the forward end and around the side walls with a suitable airiiltering material such as felt or other iibrous material so as toprovide a large 15 air chamber 1 in front or the delivery side of thefan. The side and end walls of this chamber are made large enoughso thatthe filter provided thereby has a large enough filtering capacity topermit the air to filter therethru with a minimum 20 resistance to theair. In this way the fan is kept at its normal speed and delivers lteredair in substantially the same quantity as it would deliver unilteredair. The walls of the air chamber provided by the filtering materialalso absorb g5 g the fan noises and thus quiet the operation of the fan.

In Figure 2 I have illustrated the fan with the airY chamber provided bya filterhousing I located at the rear or intake side ofthe fan. This 30housing extends from the rear of the cage 4 surrounding the fan l sothat all air to be delivered' by the fan passes thru the ltering housingbefore it is discharged into another air chamberv 9 atthe front ordelivery side of thefan'. 'Ihis 35 second chamber is made up of'suitableimperiorate material and the end is preferably reduced in size with aplurality of noise reducing tubes Il, i0 leading therefrom to providefor the'discharge of the air from the air chamber 9. It has 40 beenfound that the use of a plurality of small tubes having a length ofapproximately. six and one-half times their diameter effectivelysilences noise carried by the air on its passage thru these tubes. 'Ihisfeature, coupled with the use of an 45 air chamber at theintake anddischarge side of .the fan, eiliciently absorbs and silences any noisescreated by the fan in deliveringair and makes the operation of the fanpractically noiseless.

In Figure 3 I have illustrated another modied 50 form of the combinedfan and filter embodying my invention. In this modied form the iilterhousing II which is carried by and extends forwardly of the fan cage 4,is surrounded by an imperforate .housing i2 so as to cause -all oi theg5 air passing thru the filtering housing to be directed forwardlythereof.

In the modified form of my invention illustrated in Figure 4 the filter,fan and silencer are incorporated in a cabinet I3 which is adapted tobe' set up anywhere on the floor of a room. In this way one or more ofthese units may be set up at the most advantageous point in the room forthe ventilation and creation of air currents in the room. In this unitthe filter panels I4, I4 are removably arranged in the side walls andthe bottom of the cabinet and are protected by a suitable screen whichcovers the openings in the cabinet as illustrated in Figure 5p The fanI5 is suitably mounted in the cabinet above the filtering units so as toforce the filtered air out thru the silencing tubes I6 at the topthereof.

Over the top of the cabinet is placed the shield II so as to deflect theair downwardly around the outside of the cabinet and distribute it overa large area in the room. The inside of the upper portion 'of thecabinet thru which the air is forced by the fan, as Well as th underside of the shield I1, is covered with a sound absorbing material tohelp in-silencing all fan and air noises created by the unit. In thisway the combined air filtering and circulating unit may be placed.at anyconvenient point `in a room to pick up the air for re-circulation in theroom and filtration theiroom. In this way the cooling effect of the ivmoving air is most effective where it is needed and any moisture in theair is absorbed by the substantially stationary layer of hot air locatedbetween the cooling and filtering unit and the ceiling of the room whichmay be carried off by a suitable fan I9 in the Wall or ceiling of theroom.

I claim: y

1. Means for absorbing the noises carried by air under pressure whichcomprises a casing forming an air chamber, an inlet and an outlet forsaid casing and a plurality of silencing tubes having a lengthsubstantially six and one-half times their diameter located within saidair chaml the silencing tubes have a length that is a mul tiple inlength of a tube having a length substantially six and one half timesits diameter.

LEWIS L. DOLLINGER.

